CVE-2026-58093

⚠️ high

Summary

The TIOCSCTTY ioctl handler drops the tty lock in order to acquire the process tree lock. After reacquiring the tty lock, the handler did not revalidate the state of the terminal, and could proceed to link a terminal that was concurrently being destroyed to the calling process' session. An unprivileged local user can exploit this race condition to escalate privileges.

CVSS Score

7.0

High

EPSS Score

0.1

Exploit Probability

Published Date

2026-08-26

First Seen: 2026-08-28

📊 Relative Risk Intelligence

This CVE is Moderate Risk - more severe than 50.5% of all 365,890 vulnerabilities in our database.

#180,951

Above average severity

Severity Percentile

🎯 CISA SSVC Assessment Updated: Aug 26, 2026

🔍 Exploitation Status

None

No known exploits

⚙️ Automatable

Requires human interaction

💥 Technical Impact

Total

Complete system compromise possible

🏆 Discovered By

tsune of GMO Cybersecurity by Ierae, Inc. working with TrendAI Zero Day Initiative

SSVC data provided by CISA

Last Modified 2026-09-24

Source NVD 🔗

CVSS Vector 3.1 CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H

CWE IDs (Weakness Types)

CWE-362 CWE-416

📦 Affected Products 3

Vendor	Product	Status	Affected Versions
freebsd	freebsd	Affected	v14.4
freebsd	freebsd	Affected	v15.0
freebsd	freebsd	Affected	v15.1

🔗 References 1

https://security.freebsd.org/advisories/FreeBSD-SA-2...

Vendor Advisory

🔗 Related CVEs 6

CVE ID	Severity	CVSS	EPSS	Summary	Published
CVE-2026-58089	⚠️ high	7.8	0.1	When a process calls execve(2) to execute a setuid or setgid image, hwpmc(4) is supposed to detach PMCs owned by unprivi...	2026-08-26
CVE-2026-58090	⚠️ high	7.8	0.2	The SOCK_STREAM receive path in the unix socket implementation failed to fully detach control messages from the socket b...	2026-08-26
CVE-2026-58091	⚠️ high	7.8	0.2	The implementation of this ioctl attempts to acquire locks on all channels in a sync group. If locking a channel would ...	2026-08-26
CVE-2026-58092	⚠️ high	8.1	0.4	In FreeBSD 15.0, the kernel structure used to represent user credentials changed: previously the primary group ID was st...	2026-08-26
CVE-2026-58094	⚠️ high	7.8	0.1	The FIOSSHMLPGCNF ioctl(2) operation configures the page size for a largepage shared memory object. This is intended to...	2026-08-26
CVE-2026-58095	⚠️ high	8.8	0.6	mp_Enddisc() used incorrect length calculations when formatting endpoint discriminator addresses for display, allowing a...	2026-08-26

These CVEs affect the same products